The official Star Wars Celebration website has posted some dates for Celebration Anaheim (April 16-19, 2015) that you should be aware of if you're considering hosting a panel, registering for the art show or for media credentials, or exhibiting on the show floor. Here are those dates:

Fan Programming: You can submit your panel proposals now. Lucasfilm will begin responding on April 7, 2014; all proposals must be sent by December 15, 2014; and Lucasfilm will make all fan programming decisions by February 1, 20145.